Blue azo dye and process of making same.



Patented May 10, 1904.

KARL JAGERSPAOHER AND THILO KROBER, OF BASLE, STVIIITZERLAND,

ASSIGNORS TO THE FIRM OF SOCIETY OF HEMlOAL INDUSTRY IN BASLE, OF BASLE, SWVITZERLAND.

BLUE AZO DYE AND PROCESS OF MAKING SAME.

SIECIFICATION forming part of Letters Patent No. 759,284, dated May 10, 1904.

Application filed January 5, 1904. Serial No. 187,817. (No specimens.)

To all whom it may concern:

Be it known that we, KARL JAG ERSPAOHER, chemist and doctor of philosophy, a subject of the Emperor of Austria-Hungary, and THILO KROBER, chemist and doctor of philosophy, a

l/ FNH-acidyl (in which y may be an alkyl radical, chlorin, or other halogen, SO3H, O0.0H, &c.,)as, for instance, monoacidyl-2:5-diamidoparacresolethers, monoacidyl 2 :5 diamidoparachlorophenolcthers, &c. These dyestuffs are amidoazo dyestuffs of the general formula:

one

( 1 having the same significance as in the preceding formula.) For the manufacture of the dyestuffs one molecule of one of the said monoacidyldiamidophenolethers is diazotized, the resulting diazo derivative, combined with one molecule of a sulfoacid of 1.8-dioxynaphthalene in an aqueous solution containing acetic acid or sodium carbonate and the acidyl group of the acidylamidoazo dyestuif thus obtained,

finally eliminated by ebullition with saponifyingagents-as, for instance, soda-lye. The amidoazo dyestuffs thus obtained constitute powders of bronze luster, which are easily soluble in water with blue coloration, which aqueous solutions of the dyestuffs the free dyestuff acids are precipitated in the form of brown-red flakes. They dissolve in concentrated sulfuric acid with a red-violet coloration and dye wool in an acid-bath in pure-blue tints fast to light and to alkali.

The following example illustrates the manufacture of the new dyestuffs: 21.4 kilos of monoacetyl-Q:5-diamido 4 chlorophenolmethylether are dissolved in about three hundred kilos water and thirty kilos hydrochloric acid of thirty-per-cent. strength and diazotized by means of seven kilos of sodium nitrite, care being taken to cool with ice. The diazo solution thus produced is poured into a cooled solution of thirty-two kilos of dioxynaphthalenedisulfonic acid in about eight hundred liters water containing an excess of sodium carbonate. WV hen the combination is complete, one hundred and fifty kilos of caustic-soda lye of thirty-per-cent. strength are added, and the mixture is boiled for about an hour to eliminate the acetyl group. The excess of alkali is then neutralized by hydrochloric acid and the dyestuff is precipitated by adding common salt. It constitutes a powder of bronze luster which dissolves in water with blue color, turning to red by an addition of soda-lye (caustic soda) and to red violet on addition of acetic acid. On addition of a mineral acid to an aqueous solution of the dyestufl the free dyestufi' acid is precipitated as brownred flakes. The solution of the dyestuif in concentrated sulfuric acid is red violet. It dyes wool in an acid-bath pure-blue tints which are OH: OH: SO3H: S0311: 1:8:316

may also be used other sulfo-acids of 1:8-dioxynaphthaleneas, for instance, dioxynaphthalenernonosulfomc acid,

OH: OH: SOgH l: 8: 4, dioXynaphthalcncdisulfonic acid,

OH: OH: SOgH: SO3H I: 8: 2: 4,

or dioxynaphthalenedisulfonic acid,

OH: OH: SOKH: S0311 1: 8: 1: 6.

(wherein 3 may be an alkyl radical or halogen, SOgH or (10011,) then combining one molecule of the resulting diaZo compound with one molecule of a peridioXynaphthalenesulfonic acid and finally treating the thus-obtained acidylamidoazo dyestuff with a saponifying agent.

2. As a new article of manufacture the herein-described blue monoazo dyestuif corresponding to the formula onm CWH-Px 1 gofiiam (wherein 7 may be an alkyl radical, a halogen, SOaH or (JQOH) which constitutes in dry state a powder or bronze luster soluble in water with a blue coloration which turns to red on addition of soda-lye and to red violeton addition of acetic acid, soluble in concentrated sulfuric acid with a red-violet color, is precipitated from its aqueous solutions on addition of a mineral acid in form of the free dyestuff acid, as brown-red flakes and dyes wool in an acid-bath pure-blue tints fast to light and alkali.

In witness whereof we have hereunto signed our names, this 19th day of December, 1903, in the presence of two subscribing witnesses.

KARL JAGERSPACHER. THILO KROBER.

itnesscs:

AMAND BITTER, ALBERT GRoE'rER. 

